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RATENT OFF i -mAssacHUsEmra .1

Stpixtiencinbnatih;arrangement,and 'operation of parts, asherein'ater morepar- 'ticularl `described and-shown? and pointed A Referring to the accom anyin'gdrawings: Figure'lisfasectiiial ace viewof an ig- 'fnitinlftimerembod 'ng my invention'and operatively 'mounte "upon an engine cam 'sfhaftftlieront vportion of the casmg being cutawazf' i l2,a`fside elevation of the rotor carr1er f3, a Ffront elevation vof the same;

Fig.'` A4f',''aflongitudinalvertical section shw1ngthe"method of'mou'ntin the rotor A carrier on Vthe shaft, the yfront an` l real" por l'tibnsiir'"the"rizito'r assembly beiiig'cut away;

Fig.4 5, a sectional/.httomyiew of the cfmta'ctearm on *a longitdinal' cuived lme 'Fig 6, a longitudinal vertical section of the rotor portion operatively mounted;

Fig. 7, a vertical cross-section. of the rotor assembly on a plane coincident vvith the 50 inner face of the outer radial carrier-arm;

Fig. 8, a side elevation ofthe rotor assembly center of the cup-Washer llbeing reduced and threaded to receive a pair of nuts 1l. 12. Y which are employed to coperate .with a Hat Fig-@9; a side-elevationof one'of'the plates of the contact arm; "f f F1 .\1( a side elevation yof-the pinion 55 Whic :the contaetfroll is mounted f i f Fig. 1-1,'an endfvievg' of the same; i1 fr F1g.-,.12, .a-'view similartovFig: '10,-'-0.fa modification; andra f 1 Fig. `13, an end-view of the same. l 60 -The 'mechanism herein illustrated is .-,de 'signed for use in 'connection :witli'fa .fourcylintieme losivefengne havingaa gear-:driven 'c'aniesha operated. :by: s-the :fmain n engine shaftgfbut itshouldbe un'des'tood',^ho wevfer, B5 that my vinventionis 'applicable for `ruse-With Inotorsjhaving an number of explosion cylinders, and'rnay e otherwise'mounted and i l`Vlrlthin .the casing .1- is? an insulation-:ring 70 2, of '.which the 'inner rim '8 formsasuitable xlfirl :path over which the rotor portion-.travels Arranged at Iregular intervalson said rim ing apart of? the traveled courseofftherim,

said contacts being suitablyconnected 4to 4sepz-irate.-bindlne-posts 5, 5, etc., mounted on -within the casing l is a metal carrier 7 inthe form o a sleeve which is normally secured against axial movement on the cam-shaft byz85 a transversely arranged removable pin 8 projectingthrouoh the shaft and: extending at opposite ends into slots 9, 9`,- (Fig. Bj) provided in the outer rim of the carrier. lThe `pin v8 -is secured against endwise displace-f 90 ment by a cup-Washer 10 fitted overthe outer end ofthe carrier and extending over the 'exposed eilds ci the'pin 8,-the outer end of the cam-shaft 6 which extends through the washer 13 to secure the cup-washer in position.

The carrier 7 is provided with a pair of lateral arms 14, 14, arranged thereon in spaced parallel relation and pivotally supporting at their outer ends a contact-arm, comprlsing preferably a pair of oppositely Vcutting away the bodybf the dimensions so 'asito gins'uret e. rigidity bear unevenly on-.the .ring-2, Thefmodicaarrangdplates 15,15, secredtattheir-inner ends to the carrier-arms 14, 14, by a. transv ersely arranged hinge-pin 16. The'hii'gepin 16 rhas'e'rediice'zdY terminal extensions 17,' 1'7", adapted' to 4{it-into corresponding openings 18 in the plates 15, being burred overTr the plates after assembling to preventdisplacement of the latter. The spacin vof thefplates 15"-*i's maintaine centrally y a of A manufacture are= :preferably frmedu by in: to 1 accurate :of the pinnits settinge. A;ny.l oosenesso the pin inl-thsrespect invites :playnwhich :11.1 time causes the contact-roll to wabbleand tion; shown-1n 12 andpl3-illustrates lan axle-pin A26 -havinfterininal extensions 27, f27V provided wi singleflat faces formed bycuttin awayfthe ,marginou one ist a simple untazystructure whch,when subpending '-application.

sideonly. Thea e-pin herenshown forms jected :to a process of hardening after formm ivo-:provide a'. durable bearing surface, otgiars a substitute .fon the rovision of a separate hardened bushing, intervening the pin and the roller, as shown inlmy sind co- :.Hardening of the axle-pm results in greatly extending the com paratively brief period1 in ordinary experience during which the contact-roll maintains an even engagenlent with the contacts 4, 4, etc., a condition essential to .,eiiectivei and reliable'rignition. .l

The free end of the contact-arm is impelled outward and normallyImaintamed'n movable engagement with the insulation ring 2' and contacts 4, 4, etc., under the 1mulse of a torsion sprin 28 carried on the inge-pin 16 between t e carrier-arms 14, 14, one end of the spring being extended outward to bear preferably a ainst the underside of the spacer-pin 19 lan the oppositeA end being extended; inward :forgfgagement with the carrier 7. The outwar swin of the'contact-arm is limited positively pre egably' 'by'manslef fafshbindr a9 zprdvided naar ,the base and forming'asteY-:fr en- -ened hearing portique fion-i suppgiungf-.the

roller ,1. and shaving reducedkrmmal. exten- .sions extending intosai d,openings,'in the jaw, at least one of said terminal eir'teii'sions .and rits correspondingopening; jaw

having coperatingperip erall means finch.

' 2. 'An igxrition` .timer havingya-rotor mounted to rotate2 uponf'angaxis and.. having `9o a jaw, aroller mountednl and arrangedto travelwith said jaw, and-a roller1 journal having terminal extension; members extending into opposite sides ofsaidfjavv4 having a hardened bearing portion providin support for the roller, at least voneY lof sai extenslon members having one or. .',x nore facets adapted to coperate with ,means on Athe corresponding sideof saidjaw to retain said journal in a stationary position;r ela tively tothejaw.

3. A rotor for ignition Vtimers apertured jaw members 1 5, a roller 22 mounted on and arranged to travel with said ing a hardened bearing portion. and comprising faceted terminalextension.` members 24 extending into said jaw members, the jaw members being formed to coperate with the terminal extension members to retain said. roller journal. in stationary position.

In testimony whereof, I have signed 4my name to this spJecifcation.

E WARD B. J ACOBSON.

jaw members, and a 4 roller journal 23 hav-,1 

